Taylor Swift loves hanging out with her famous pals—but she loves surprising her audience with awesome duets at her concerts even more! Taylor has brought Katy Perry, Justin Bieber, and even Nicki Minaj on stage before, but fans were completely shocked when Fall Out Boy's Patrick Stump joined her to perform "My Songs Know What You Did In The Dark" in New Jersey last weekend! The country crooner channeled her inner rock star—and it totally works. Think Taylor is inspired enough to record a rock song on her next CD?

You can check out the video here!

What do you think of Taylor and Patrick's performance? Let us know in the comments section!